The posteromedial knee capsule reinforces the posterior medial joint boundary, providing the posteromedial corner constraint alongside the posterior oblique ligament and semimembranosus expansions.
Contributes to posteromedial rotational stability, supplements the MCL and POL in resisting valgus and external rotation, and forms the posterior medial joint boundary.
Posteromedial capsular tightening (posteromedial capsulorrhaphy) is performed in medial compartment reconstructive surgery to reduce posteromedial instability when the PMC is insufficient after ligament repair.
Posteromedial knee capsular plication combined with MCL repair to address combined medial and posteromedial instability patterns in complex knee ligament injuries.
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